bpo-38155: Add __all__ to datetime module (GH-16203)

https://bugs.python.org/issue38155

Lib/datetime.py

@@ -4,6 +4,10 @@ See http://www.iana.org/time-zones/repository/tz-link.html for
 time zone and DST data sources.
 """
 
+__all__ = ("date", "datetime", "time", "timedelta", "timezone", "tzinfo",
+           "MINYEAR", "MAXYEAR")
+
+
 import time as _time
 import math as _math
 import sys

Lib/test/datetimetester.py

@@ -62,6 +62,12 @@ class TestModule(unittest.TestCase):
         self.assertEqual(datetime.MINYEAR, 1)
         self.assertEqual(datetime.MAXYEAR, 9999)
 
+    def test_all(self):
+        """Test that __all__ only points to valid attributes."""
+        all_attrs = dir(datetime_module)
+        for attr in datetime_module.__all__:
+            self.assertIn(attr, all_attrs)
+
     def test_name_cleanup(self):
         if '_Pure' in self.__class__.__name__:
             self.skipTest('Only run for Fast C implementation')

Misc/NEWS.d/next/Library/2019-09-16-21-47-48.bpo-38155.d92lRc.rst

@@ -0,0 +1 @@
+Add ``__all__`` to  :mod:`datetime`. Patch by Tahia Khan.